Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 7 - Section 7.4 - Periodic Trends in Properties of Elements - Checkpoint - Page 299: 7.4.1

Answer

Option a is the right option. Ca < Sr < Ba

Work Step by Step

On moving from Top to Bottom in the periodic table the atomic size of the elements increases and So the first Ionization energy decreases ($I.E_1 \downarrow$) So, Ca < Sr < Ba will be the right order
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